why student prefer MBBS instead of BDS,BAMS and all other courses? Every MBBS graduate gets job in government sector??

First some information about course under NEET.

MBBS
(Or: Bachelor of Surgery, Bachelor of Medicine) is the predominant medical Undergraduate Course in India. It is the route to become a doctor of modern medicine in the country. A person holding the MBBS degree becomes a certified medical practitioner.

BDS
(Or: Bachelor of Dental Surgery) degree is one of the most popular and designated degree courses in dentistry in India. This course is one of the most sought-after Courses in the Medical Field, only next to MBBS.

BAMS
(Or: Bachelor of Ayurvedic Medicine and Surgery) is recognized and integrated degree in the medical field, and is specially designed to teach students the systems of the traditional Indian system of Ayurveda.

BHMS
(Or: Bachelor of Homeopathic Medicine and Surgery) covers the various aspects of medical knowledge of the homeopathic system. BHMS awards one with the right to practice homeopathy and its various systems as a homeopathic doctor.

MBBS allows you to gain more in-depth knowledge of medicines and surgery, while BAMS allows you to gain knowledge on the traditional Indian system of Ayurveda, and BDS allows you to obtain knowledge in the field of dental studies

Its not guaranteed that even mbbs student get government job , job depend on your hard work and passion.

Hope you will get some help.